Mechanical time fuse



Feb. 5, 1935.

H JUNGHANS MECHANICAL TIME FUSE Ei-led Sept. 1, 1933 1 EA rzo y Patented Feb. s, 1935 UNITED STATES MECHANICAL. 'IIME FUSE Helmut Junghans, Sulgen, near Schramberg,

' Germany Application September 1, 1933, Serial No. 687,898

. In Germany September 1, 1932 SClalma.

This invention relates to a mechanical time fuse in which the adjustment of the operating mechanism is effected by means of an adjustment disk, which is rotatable about a spindle disposed in the longitudinal direction of the fuse, and co-operates with a setting or looking lever (catch), which falls into the said adjustment disk radially.

Now it has been'found in connection with fuses of this character that if the guide rings of the projectile are not situated initially in the rifling of the barrel the relatively thin adjustment disk, owing to the inertia of the moving masses when firing takes place and the projectile enters the rifiing of the barrel, thrusts or collapses with its outer portion, 1. e. in the direction of the projectile towards the front, in consequence of which the setting or locking, lever is subject to premature release and engagement with the disk. The engagement of the lever in advance of the proper time induces premature ignition on the part of the projectile, and it is then doubtful whether the latter will reach its mark.

According to the invention. drawback is overcome by a device which, without varying or affecting the cc-operation between the disk and the lever, renders excessive and detrimental variation in the form of the adjustment disk a matter of impossibility, and accordingly prevents in perfectly reliable fashion an undesired actuation of the locking or setting lever.

Two forms of'embodiment of the invention are illustrated by way of example in the accompanying drawing, in which Figure 1 is an elevational view of "one form of embodiment of the fuse, partly in section and Figure 2 a plan, while Figure 3 shows a modified form of embodiment.

The guard device according to the invention resides substantially in the fact that above the adjustment disk, and primarily above the edges thereof, abutments are formed, which engage over' the disk and accordingly prevent the same from thrusting or collapsing at its outer portion towards the front, i. e. into the position indicated in broken line in Figure 1, beyond the extent permitted by the clearance necessaryto ensure free rotation ofthe disk.

01. ice-3e) In the. form of embodiment according to Figures l and 2 there is secured to the upper part. of the body 1 of the fuse an angularly bent ring 3, which engages with its upper, inwardly pro.- jecting portion over the adjustment disk, and thus forms an annular abutment preventing an excessive bending of the adjustment disk towards the front.- The spacing between the ring and the disk should accordingly not exceed such an amount that even when the disk moves against 10 the ring the same is still capable of retaining the locking lever 4, and the latter will not be actuated too soon.

At the point of location of the lever the adjustment diskis preferably furnished with a recess 15 31: allowing the lever free play at the correct moment and permitting of a proper check withregard to its adjustment.

In place of the ring it is naturally also possibite in conformity with Figure 3, to provide single angular members 5 distributed aboutthe periphery of the fuse and engaging over the adiustment disk in hook-like fashion and thus restricting its tendency towards a marginal thrust or collapse in a forward direction.

What I claim as new and desire to secure by Letters Patent is:-- g r 1. A mechanical time fuse, comprising a spindle disposed longitudinally in the said fuse, an adjustment disk rotatableabout said spindle, a looking lever adapted to engage radially with the said disk for producing ignition, but withheld from the same in the normal condition of the fuse, and an angular bent ring provided around and above the disk for preventing forward 001- lapse of the outer portion of the said disk with consequent premature release of the said lever upon the firing of the projectile.

2. A fuse according to claim 1, in which the ring is provided with a cut out portion for the 40 locking lever.

3. A fuse according to claim 1, in which the ring is in the form of spaced angular. bent members.

HELMU'I' JUNGHANS. 

